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CVE-2026-25520— SandboxJS has a Sandbox Escape

Quick assessment

Affected
nyariv SandboxJS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SandboxJS是nyariv个人开发者的一个安全评估软件。 SandboxJS 0.8.29之前版本存在安全漏洞，该漏洞源于函数返回值未包装，可能导致沙箱外执行任意代码。

CVSS 10.0 · Critical EPSS 0.89% · P59

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-25520

Vulnerability Information
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Vulnerability Title
SandboxJS has a Sandbox Escape
Source: CVE Program / CVE List V5
Vulnerability Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
SandboxJS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SandboxJS是nyariv个人开发者的一个安全评估软件。 SandboxJS 0.8.29之前版本存在安全漏洞，该漏洞源于函数返回值未包装，可能导致沙箱外执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
nyariv SandboxJS < 0.8.29 -

II. Public POCs for CVE-2026-25520

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III. Intelligence Information for CVE-2026-25520

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Patches & Fixes for CVE-2026-25520 (1)

Vendor Advisories for CVE-2026-25520 (1)

Same Patch Batch · nyariv · 2026-02-06 · 4 CVEs total

CVE-2026-25641 10.0 CRITICAL SandboxJS has a sandbox escape via TOCTOU bug on keys in property accesses
CVE-2026-25586 10.0 CRITICAL SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution
CVE-2026-25587 10.0 CRITICAL SandboxJS has a Sandbox Escape

IV. Related Vulnerabilities

Same product: SandboxJS
Same vendor: nyariv
Same weakness: CWE-74

V. Comments for CVE-2026-25520

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